Your idea is a much better idea, consolidating the manuals like you suggested is great until you need that 1 temper and we’ll just run into the same issue, bricking them.
Personally I’d like to see a feature where you can force a temper but at a much lower value, worse case you can gamble and that’s a choice you make, you’re not forced. Or you force it shattering any remaining temper rolls and fixing it to a lower value.